From ba645c16026ed733a51f904df34756f61bc155fc Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Tue, 27 Sep 2005 16:03:05 -0700 Subject: [PATCH] [NET]: Slightly optimize ethernet address comparison. We know the thing is at least 2-byte aligned, so take advantage of that instead of invoking memcmp() which results in truly horrifically inefficient code because it can't assume anything about alignment. Signed-off-by: David S. Miller --- net/ethernet/eth.c | 31 +++++++++++++++++++++---------- 1 file changed, 21 insertions(+), 10 deletions(-) diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c index 87a052a9a84..8b299cc8206 100644 --- a/net/ethernet/eth.c +++ b/net/ethernet/eth.c @@ -146,6 +146,19 @@ int eth_rebuild_header(struct sk_buff *skb) return 0; } +static inline unsigned int compare_eth_addr(const unsigned char *__a, const unsigned char *__b) +{ + const unsigned short *dest = (unsigned short *) __a; + const unsigned short *devaddr = (unsigned short *) __b; + unsigned int res; + + BUILD_BUG_ON(ETH_ALEN != 6); + res = ((dest[0] ^ devaddr[0]) | + (dest[1] ^ devaddr[1]) | + (dest[2] ^ devaddr[2])) != 0; + + return res; +} /* * Determine the packet's protocol ID. The rule here is that we @@ -158,16 +171,15 @@ __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev) struct ethhdr *eth; unsigned char *rawp; - skb->mac.raw=skb->data; + skb->mac.raw = skb->data; skb_pull(skb,ETH_HLEN); eth = eth_hdr(skb); - if(*eth->h_dest&1) - { - if(memcmp(eth->h_dest,dev->broadcast, ETH_ALEN)==0) - skb->pkt_type=PACKET_BROADCAST; + if (*eth->h_dest&1) { + if (!compare_eth_addr(eth->h_dest, dev->broadcast)) + skb->pkt_type = PACKET_BROADCAST; else - skb->pkt_type=PACKET_MULTICAST; + skb->pkt_type = PACKET_MULTICAST; } /* @@ -178,10 +190,9 @@ __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev) * seems to set IFF_PROMISC. */ - else if(1 /*dev->flags&IFF_PROMISC*/) - { - if(memcmp(eth->h_dest,dev->dev_addr, ETH_ALEN)) - skb->pkt_type=PACKET_OTHERHOST; + else if(1 /*dev->flags&IFF_PROMISC*/) { + if (unlikely(!compare_eth_addr(eth->h_dest, dev->dev_addr))) + skb->pkt_type = PACKET_OTHERHOST; } if (ntohs(eth->h_proto) >= 1536) -- 2.41.1